Have a 90TT with auto climate that I swapped to the newer style controls and control unit about 10 yrs ago, it just started acting strange. set ac to 72 comes on and just stays at full speed cold never slows up when it reaches temp. I can still manually control everything from the pod, lower/raise the fan speed, select different modes feet/def/face etc, recon works too. plugged into conzult returned no errors. any ideas or further tests? do I need a new control unit?